信不信扑倒你有本事你来阿
[xìn bù xìn pū dăo nĭ yŏu bĕn shì nĭ lái ā]
It translates literally as 'Do you believe I'll throw myself at you; come at me if you dare'. This seems informal and challenging; expressing the desire to challenge someone else, indicating competitiveness, boldness or playfulness depending on the context.